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Finding the Fourth Proportional to 1,126, 1,553.90 and 660.24

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Solution

The fourth proportional to 1,126, 1,553.90 and 660.24 is: 911.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126 : 1,553.90 = 660.24 : x
  2. Step 2: Convert to fraction form
    1,126/1,553.90 = 660.24/x
  3. Step 3: Cross multiply
    1,126x = 1,553.90 × 660.24
  4. Step 4: Simplify right side
    1,126x = 1,025,946.94
  5. Step 5: Solve for x
    x = 1,025,946.94/1,126
  6. Step 6: Final answer
    x = 911.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.